View Usps International Large Flat Rate Box Dimensions Images. Priority mail international® service is a reliable and affordable way to ship to more than 190 maximum weight for medium and large priority mail international flat rate boxes is 20 lbs. Usps priority mail flat rate boxes are great.
The rates below reflect usps commercial plus pricing, which is available when shipping via easypost.
International insurance & extra services. Priority mail international® service is a reliable and affordable way to ship to more than 190 maximum weight for medium and large priority mail international flat rate boxes is 20 lbs. You can use your own boxes and still send via usps flat rate so as long as the total dimensions do not exceed 108 inches or less in combined length and girth and the weight limits are adhered to maximum. Postal service (usps) that features one flat rate for delivery of a package or envelope to its destination.